Method of preparing carbon-based sulfur-loading iron-containing adsorbent for mercury removal

Patent metadata

Field	Value
Publication number	US-11420183-B2
Application number	US-202016833545-A
Country	US
Kind code	B2
Filing date	Mar 28, 2020
Priority date	Dec 10, 2018
Publication date	Aug 23, 2022
Grant date	Aug 23, 2022

Abstract

This invention introduces a method of preparing a carbon-based sulfur-loading iron-containing adsorbent for mercury removal, which can solve the problems in the prior art that sulfur-rich heavy organic materials have low-value utilization and the elemental mercury in atmosphere is hard to be efficiently and economically removed by the existing mercury removal agents. A carbon-based sulfur-loading iron-containing adsorbent for mercury removal is prepared in this invention. The adsorbent with a porous structure is prepared in situ by performing steps such as chemical activation of sulfur-rich heavy organic materials that are rich in iron. The adsorbent prepared herein has good mercury removal performance in simulated coal-fired flue gas. This invention not only improves the utilization value of sulfur-rich heavy organic materials, but also prevents SOX pollution caused by the combustion of sulfur-rich heavy organic materials and controls mercury pollution in the coal-fired flue gas.

First claim

What is claimed is:

1. A method for preparing a carbon-based sulfur-loading iron-containing adsorbent for mercury removal, comprising:
(1) drying, grinding and sieving a sulfur-rich iron-containing heavy organic matter with a sulfur content more than 1% to obtain a sulfur-rich iron-containing heavy organic material;
(2) mixing the KOH and the sulfur-rich iron-containing heavy organic material obtained in step (1) uniformly according to a mass ratio of 0.5-1:1 to obtain a mixture and dropwise adding an aqueous ethanol to the mixture for infiltration;
(3) placing the infiltrated mixture obtained in step (3) in a tubular furnace to perform the calcination and activation under the protection of N 2 , thereby obtaining an activated product; and
(4) washing and filtering the activated product with hot water repeatedly until a pH of a filtrate is 7, and drying the product to obtain the carbon-based sulfur-loading iron-containing adsorbent for mercury removal.

2. The method of claim 1 , wherein the sulfur-rich iron-containing heavy organic matter in step (1) is high sulfur coal or coal liquefaction residue.

3. The method of claim 1 , wherein a drying temperature in step (1) is 60-110° C.

4. The method of claim 1 , wherein a mesh number of a sieve used during the sieving in step (1) is 20 mesh or less.

5. The method of claim 1 , wherein the aqueous ethanol in step (3) is a solution of absolute ethanol and water mixed in a volume ratio of 2:8, and a ratio of a volume of the aqueous ethanol to a mass of the sulfur-rich iron-containing heavy organic material is 0.4-1.5 mL/g.

6. The method of claim 1 , wherein the calcination and activation in step (4) are performed at 400-1000° C. for 1-5 h.

7. The method of claim 1 , wherein a temperature of the hot water in step (5) is 50-100° C., and a drying temperature is 110° C.

Assignees

• Univ Taiyuan Technology
• China Shenhua Coal To Liquid & Chemical Co Ltd

Inventors

• Wang Jiancheng
• Huo Qihuang
• Chen Huijun
• Han Lina
• Shu Geping
• Chang Liping
• Bao Weiren

Classifications

• B01D53/02

  by adsorption, e.g. preparative gas chromatography {(solid sorbent compositions B01J20/00, preparation of inorganic compounds or elements C01)} · CPC title

• B01D2257/602

  Mercury or mercury compounds · CPC title

• B01J2220/42

  Materials comprising a mixture of inorganic materials (materials coated or impregnated on a carrier B01J20/32) · CPC title

• B01D2253/25

  Coated, impregnated or composite adsorbents · CPC title

• B01J20/3085

  Chemical treatments not covered by groups B01J20/3007 - B01J20/3078 · CPC title